Improvement in apparatus for shaving the heads of screw-blanks



l ,TUNTTeo STaTns ATENT f1# Ferca.-

H. A. HARVEY, 0F NEW YORK, N. Y.

IMPROVEMENT IN APPARATUS FOR SHAVING THE HEADS OF SCREW-BLANKS.

Specification forming part of Letters Patent No. 2,767, dated May 17,1864.

To all whom it may concern:

Be it known that I, H. A. HARVEY, have invented certain new and usefulmachinery for shaving the heads of screw-bla1'1ks, parts of which areapplicable to other purposes; and Ido hereby declare that the following,taken in connection with the drawings, is a full, clear, and exactdescription theieof.

In the drawings, Figure l is a side elevation; Fig. 2, a plan of themachine; and Fig. 3 an elevation of and section through the cutter-head, tool-holders, &c.

This machine is similar in many respects to those for nickin g andthreading screwblanks invented by me, and for which applications forpatents are made cotemporaneously with this one, and the description inthis specifica tion will be somewhat general, those desiring more fullinformation being referred to the description of the other machines.

VAll parts of this machine are mounted upon a bed-plate, c a, on which,in proper guides, is supported a carriage or slide, b b, in which ismounted a carrying-wheel, c c, from the periphery of which project aseries of spring receivers and holders, d d. These receivers are bypreference made of steel turned on the outside and bored out on theinside, and slit, as shown in the drawings. Each receiver'niay,moreover, be provided with a set-screw to close the bottom of itscavity, as shown at e e. Each receiver has its outside beveled at theend thereof; and in line with the axis of the carrying-wheel a conicalsocket, o, is secured to the bed-plate of the machine. The bore of thereceivers :is of such size that screw-blanks will fall easily into them,and the slits are so contrived that the blank can be held or graspedrmly in the carrier, as in a vise, when the conical end of the latterisforced into the conical socket or gripper. This gripper is representedin the drawings as fixed fast to theframe-work, but I prefer in practiceto mount it in guides, so that it may slide to and fro in a line betweenthe cutter-h ead shaft and the center of the carrying-wheel, and tolocate a spring of indiarubber or other material in such way as to forcetl e gripper towards the carrying wheel. By this arrangement I obviateall dificulties arising from unequal diameters of blanks.

The forked carriage b b has depending from it a pin, b', which entersinto-a cam-groove, f, of a rotating cam, f. This cam has secured to it acog-wheel,f2, which is driven by a cogwheel, g, mounted on a shaft, g,on the other end of which is secured another cog wheel, g2, which is ingear with a pinion, 11 fastened to a shaft, h', which latter is to berotated by any proper machinery. Upon the shaft h is a grooved slidingsleeve, k, and a cutter-head, k', provided with sliding tool-holders k2.A lever, Z, pivoted at l, has on its upper end pins which take into thegroove in the sleeve, and this lever is vibrated through theintervention of a rod, l2, which is, by means of a spring, Z3, forced tobear against a face-cam cut on the end of the canrwheel ff. (See sketchin section, Fig. 4.)

The shape of this cam is such as to cause the tools to approach eachother gradually while a screw-blank is held for their action and untilthe shaving is completed, then to recede rapidly from each other andremain in that position until the blank just shaved is withdrawn and afresh unshaved blank is placed ready for their action, and the camwheelj" makes one revolution during the entering, shaving, and withdrawing ofa blank.

To each side of the carrying-wheel are sccured ratchet-teeth m m, andupon the frame is bolted a spring-pawl, n, iu such manner that it may headjusted so as .to strike against the teeth at the proper time. Thecarrying- Wheel has also attached to it a series of lugs, as desciibed,in the nicking-machine, and in the drawings is shown a contrivance forfeeding blanks to the receivers and holders in all respects the same asin the nicking-machine, and acting in connection with the carryingwheelin the sanne manner as there described but, as in this machine, blanksare operated upon in the condition in which they leave the header, andas there are often burrs on the heads, which will cause the slide z tocatch or stick, I prefer, in this machine, to bevel the working side ofthe latch .c in such manner that it will bend the spring y and y oft'from the lug whenever the slide is jammed or stuck fast, and in this wayI prevent fracture of the parts.

The revolving cutter-head for carrying the tool-slides, and the slides,tools, and contrivances for actuating them may be constructed in anyusual or proper manner known to makers of screw machinery. I have in thedrawings shown the tool secured in blocks or slides 7a2, free to slidein straight lines. These slideshave inclined slots cut through them,into which enter the parts of a fork, p, which is attached to the sleeve7c. As this sleeve moves back and forth the tools must approach orrecede from the blank-head, and I have found this arrangement to answerwell in practice. The carrying-wheel is to be provided with holding-pawls, as described in the nicking and threading machines, so as tohold it at rest after it has been turned and until one ofthe receiversenters the gripper. rIhe operation of the machine is as follows,supposing the machine to bein position, as shown in the drawings, andthree ot' the receivers to to contain screw-blanks: In this position ablank is represented as partially shaved, and until this is completedthe tool-head revolves, and the cutters continue to approach each other,while the carrying-wheel remains at rest. As soon as the shaving iscompleted the tools recede from each other and the groove f draws thecarriage and carrying-wheel backward, so that the receiverand blank thatit carries are free ofthe socket or gripper o, and the ratchets thenstrike against the pawls,'which cause the carrying wheel to revolvethrough the are comprised between two receivers. The socket marked ethen becomes upright and lies under the angle formed by the two parts ofthe ways carrying the column of blanks. A fresh blank is then droppedinto the receiver fu, while it and the whole series of receivers and thecarryingavheel are being advanced by the cam-groove f. As they are thusadvanced the blank next in succession to the one just l shaved is byitscarrier forced into the gripper,

and the latter, acting on the conical end of thc v receiver, causes itto grasp the blank Ijrmly. The pin b has now returned again to thesrraight part of the groove f, and the tools, which have all this timebeen revolving without performing any duty, now commence to approacheach other and shave the head of the new blank. The blank that has beenshaved is carried downward and drops out by gravity. In some cases theblanks may not be forced completely home by gravity into the sockets,and in this case the cutters might be injured. As a measure ofprecaution, therefore, I intend sometimes to locate a punch such as isindicated at u', Fig. 3, so as to shove the blank home. This punch maybe a springpunch always tending to force the blank home, and removed ontofthe wayrof the cut-ters by an inclined plane on the cutters striking apin projecting from the punch, or the punch may slide in a cavityin theshaft of the cutter-head and be connected to a sleeve which is movedforward to shove the blank home and then retracted to take the punch outot' the way ot' the cutters by any proper cam.

The tools may be 0fany proper kind, and operated in any appropriatemanner, so long` as they rotate to lshave the head ot" a blank held atrest and open to permit its removal and the entrance of a fresh blank,and it is obvious that parts of this machine, which may be fed by handor any suitable machinery, may be employed usefully for otherpurposesfor instance, the carrying-wheel, with its receivers andcarriers and gripper or grippingsocket, might be used in connection witha saw mounted on oscillating bearings, thus constituting vanflicking-machine.

I claim in this patent as ot' my own invention- The combination of aseries of receivers and holders,with a socket or gripper and properrotating s'havingtools, the whole being and acting in combination undera mode of operation substantially as specified.

H. A. HARVEY.

In presence of- JAs. J. WIGHTMAN, P. JAMns GAGE.

